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Author Topic: MSI Lightning 7970 @ 1800MHz Core clock  (Read 2700 times)
ataranlen
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March 20, 2012, 06:09:27 PM
 #1

Just saw this on the MSI Facebook page. Looks like the Lightning series GPU's will have amazing OCing potential!

Core Clock:
1800MHz
Memory Clock:
1925MHz



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March 20, 2012, 06:17:01 PM
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1.7 Volts?
Good luck with that.
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March 20, 2012, 06:23:25 PM
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Keep in mind this is under liquid nitrogen using a GPU pot. Don't expect much improvement over reference cards on air/water. I've got a set of 4 Tek9s and 90L of LN2 storage capacity if anyone wants to try running a bitcoin farm under LN2.. that whole $0.65/liter might cut in to your profits a bit. I used to competitively overclock, now I run all my overclocking gear at boring underclocks for power efficiency  Grin

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March 20, 2012, 06:26:34 PM
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Looks impressive.  But this cannot be sustained/mining OC setting I'm afraid.

What is mining rate at this clock?  How much power does it draw?  How long can it run before it crashes or burns the house?

Idle system: watts at the wall?
Mining@1800: watts at the wall?
Hash Rate@1800: Huh

I have no clue on any of those. MSI posted this to their Facebook wall, I thought I would come over here and start up our own discussion. I mentioned Bitcoin Hashing speeds in my comment on the post, so we'll see.  Wink

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March 20, 2012, 06:29:58 PM
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Hashing speed will scale linearly with MHz. Power consumption though scales exponentially with voltage increases at the same temperature. Luckily we gain the benefits of running chips sub-zero and lowering their internal resistance. So, a GTX 580 that pulls ~275w at stock clocks would only pull around 450-500w at 1300MHz core @ -130C or so. Not as bad as you'd think but it could be except for the constant pouring of LN2 to keep the core cool. Fun hobby, makes BTC mining appear cheap Smiley

edit: I note the GTX 580 as that is the last core I ran under LN2. I quit with the 7970/LGA2011 launch. Too expensive and I'd rather have hardware earn me money.

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